The rtorrent rc.d file

rtorrent

#!/bin/sh

# Basically this starts rtorrent on a screen session
# The only important thing to note is the rtorrent_user and rtorrent_group. They are the user and group respectively that rTorrent is started with. If you set these to the user and group you use for the file shares in Freenas you shouldn't have trouble with accessing torrents started by rTorrent through the share.

. /etc/rc.subr

name=rtorrent
rcvar=rtorrent_enable

command="/usr/local/bin/screen"
command_args="-d -m -S rtorrent rtorrent &> /dev/null"
stop_cmd="killall /usr/bin/rtorrent &> /dev/null"
rtorrent_user="rtorrent"
rtorrent_group="rtorrent"

load_rc_config $name
run_rc_command "$1"